CVE-2021-46008
HighCVSS 8.8Exploitation Probability (EPSS)
Elevated risk55th percentile - higher than 55% of all known CVEs
Summary
In the Totolink A3100R router with firmware version V5.9c.4577, a hard-coded Telnet password was discovered that can be extracted from the official firmware release. An attacker connected to the Wi-Fi can easily gain root shell access via Telnet if the service is enabled.
Risk Assessment
The risk involves potential full compromise of the router by an attacker on the local network, leading to breach of confidentiality and integrity of network data.
Recommendation
Immediately update the router firmware to the latest available version, and disable the Telnet service if not required. Consider replacing the device with a model that has active vendor support.
Other vulnerabilities in Totolink A3100R
See all- CVE-2021-46009Critical
In Totolink A3100R V5.9c.4577, multiple pages can be read without authentication using curl or Burp Suite. Additionally, admin configurations can be set without requiring cookies.
- CVE-2021-46007Critical
The Totolink A3100R router with firmware version V5.9c.4577 is vulnerable to OS command injection. The ping function in the admin panel does not properly filter special characters, allowing an attacker to execute arbitrary commands.
- CVE-2021-46006Medium
In Totolink A3100R firmware version V5.9c.4577, the test.asp file exposes an unauthenticated API-like function. This allows an attacker to modify multiple device settings without any authentication.
- CVE-2021-44620Critical
A command injection vulnerability exists in TOTOLINK A3100R up to version V4.1.2cu.5050_B20200504 in the adm/ntm.asp script via the hosTime parameter. It allows a remote attacker to execute arbitrary system commands on the device.
- CVE-2022-29641High
TOTOLINK A3100R routers with firmware versions V4.1.2cu.5050_B20200504 and V4.1.2cu.5247_B20211129 were found to have a stack overflow vulnerability. The issue occurs in the setParentalRules function via the startTime and endTime parameters, allowing an attacker to cause a Denial of Service (DoS) through a crafted POST request.
- CVE-2021-46010High
The Totolink A3100R router with firmware version V5.9c.4577 suffers from a vulnerability due to the use of insufficiently random values in the web configuration. The SESSION_ID is predictable, allowing an attacker to hijack a valid session and conduct further malicious operations.
Original NVD description (English source)
In totolink a3100r V5.9c.4577, the hard-coded telnet password can be discovered from official released firmware. An attacker, who has connected to the Wi-Fi, can easily telnet into the target with root shell if the telnet is function turned on.